Documentation how to make 'step series' closes #698
Documentation how to make 'step series' closes #698

djmiley/d3fc,djmiley/d3fc,bjedrzejewski/d3fc,alisd23/d3fc-d3v4,alisd23/d3fc-d3v4,djmiley/d3fc,alisd23/d3fc-d3v4,bjedrzejewski/d3fc,bjedrzejewski/d3fc